Got my gun 2 weeks ago and first time out had the assembly pin walking. Just wasn't going in enough the plastic was blocking it. Lots of ftfeeds and ftejects, did a fluff and buff , got better. Called kel tec to ask about the case mouths on the empty shells they were all bent. Last time at range sent 50 rem umc fmj only 2 fte. It seems that the extractor on some cases is letting go and the new shell is locking the empty case against the chamber,hood area, jamming the gun. Anyone else have these problems. Also have any of you guys seen the Robar gun site? The grips and finishes they do look great, google it. Thanks for any help.